<ion-view title="设置">
	<ion-nav-buttons side="left">
		<button menu-toggle="left" class="button button-icon icon ion-navicon"></button>
	</ion-nav-buttons>
	<ion-content>
		<li ng-click="clear();" class="item  item-icon-left">
			<i class="icon ion-ios7-trash"></i> 清空缓存
		</li>
	</ion-content>
</ion-view>